Abstract
The inhibitory effect of 6-/7-substituted (2'-oxo) pteridines and ichthyopterin was examined for sepiapterin reductase. 6-Acetonylisoxanthopterin and 6-acetonyl-2,4-diamino-7-hydroxypteridine showed pronounced competitive inhibitory effects to sepiapterin reductase and Ki values were 0.38 μM and 90 μM, respectively. Ichthyopterin and 6-acetonyl-7-hydroxylumazine showed weak noncompetitive inhibitory effects and Ki values were 2.4 mM and 1.1 mM, respectively. 7-Acetonylxanthopterin exhibited no inhibition to sepiapterin reductase.
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